Had my 1755D overhauled this passed spring. Now this may sound funny, but it sure seems louder than before. More noise from the engine ,not exhaust noise, I want to say it is injector noise. That jingling, rattling noise when you increase the throttle. Sounds like a power stroke Ford does when you accelerate. I sure never noticed it before. The mechanic did have the injectors cleaned and inspected, nothing was done to the pump though. Maybe I'm hearing things, but after running a tractor for years you notice these little differences. I did check the timing, it was a little advanced, but try as I might, I couldn't retard it. The pump contacts the side of the engine block. Has anyone ever experienced anything like this before?